Illegal construction in common corridor of apartment

You should file suit for permanant injunction and restrain them from doing so. 

File RTI Application and ask status of your application and what action did they take against your application.

Thank you so much for your quick responses. Can I file RTI application online? Is there any charges for that?

 

Also what does it mean by file a suit. I am an IT employee and am not much aware of this. 

You first get the information about the status of your application by submitting an application through RTI act which can be submitted through online also. 

After that you can decide about pursuing the same through due process of law. 

Please file RTI Application offline (print on A4 size paper) and affix Rs.10/- court fee stamp on it and send by Speed post

By filing suit means to file case in court

The corporation need not poke in your internal affair.As per your byelaw you put forth your grivence before the association thro' written notice. You lodge a police complaint also.If they don't take legal action You issue a notice to association and encroachers as well and file a case in civil court.

Collect relevant information from concerned department qua "common area" of the society and issue legal notice to the encroacher (flat owners) as well all authorities, (it may be waived) and file a suit for permanent and mandatory injunction or writ petition before High Court, through a local prudent lawyer. 

Municipal corporations are full of corrupt people.and they will not act. The interest of the Municipal corporation is with regard to tax collection. If any person makes an addition or alteration or construct something the property tax will be increased and their revenue will increase. They are not connected with protecting your interest. Even if they reply you, they will say that the matter is not in their purview. Your Association should act. Or you have to file a suit in a court law. If your association files the suit (provided it is a registered association) it will carry more weight. Or you have to employ thugs.